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公开(公告)号：EP1417639A1
公开(公告)日：2004-05-12
申请号：EP02752553.4
申请日：2002-07-23
申请人： INTERMEC IP CORP.
IPC分类号： G06K19/07
CPC分类号： G06K19/0702 , G06K19/0701 , G06K19/0723
摘要： An RFID tag (30) is powered both by an internal battery (22, 52) and passively by an interrogating RF field. As a result, the RFID tag can be passively powered after the internal battery has been depleted. More particularly, an embodiment of the RFID tag includes electronic circuitry to provide RFID functionality, and an energy storage device (14, 46) coupled to the electronic circuitry to provide an operational voltage thereto. A battery (22, 52) is operatively coupled to the energy storage device (14, 46) to charge the energy storage device. A rectified RF power source (12, 42) derived from an interrogating RF field is also operatively coupled to the energy storage device (14, 46) to charge the energy storage device. The rectified RF power source and the battery are electrically separated from each other. The energy storage device remains charged by the battery in the absence of the RF interrogating field while the battery has remaining capacity. After the battery has become depleted, the energy storage device is charged by the presence of the RF interrogating field.
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2.发明授权PASSIVE RFID TAG THAT RETAINS STATE AFTER TEMPORARY LOSS OF POWER 有权无源射频识别应答器（RFID标签），THE临时停电后他的状态保持
公开(公告)号：EP1481366B1
公开(公告)日：2009-02-25
申请号：EP03702060.9
申请日：2003-01-10
申请人： INTERMEC IP CORP.
CPC分类号： G06K19/0701 , G06K19/0723 , G06K19/073
摘要： The present invention provides an RFID transponder that includes a state holding cell (24) that maintains the present state of the RFID transponder during temporary losses of power. After power is restored to the RFID transponder, the state holding cell restores the present state to the RFID transponder so that transactions with an RFID interrogator can continue without having re-transmit redundant commands. The RFID transponder further comprises an RF front end (14) adapted to receive an interrogating RF signal. An analog circuit (18) is coupled to the RF front end and is adapted to recover analog signals from the received interrogating RF signal. The analog circuit provides state information defining a desired state of the RFID transponder corresponding to the analog signals. A digital state machine (20) is coupled to the analog circuit and adapted to execute at least one command in accordance with the state information. A memory (22) is coupled to the digital state machine and is adapted to store and retrieve digital data responsive to the at least one command executed by the digital state machine. A power capacitor (16) is coupled to the RF front end and derives a voltage rectified from the interrogating RF signal to charge the power capacitor. The power capacitor thereby provides electrical power for the analog circuit, the digital state machine and the memory. The state holding cell (24) is coupled to the analog circuit and the digital state machine and is adapted to maintain the state information during a loss in power provided by the power capacitor due to lapse in receipt of the interrogating RF signal by the RF front end.
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3.发明公开PASSIVE RFID TAG THAT RETAINS STATE AFTER TEMPORARY LOSS OF POWER 有权无源射频识别应答器（RFID标签），THE临时停电后他的状态保持
公开(公告)号：EP1481366A1
公开(公告)日：2004-12-01
申请号：EP03702060.9
申请日：2003-01-10
申请人： INTERMEC IP CORP.
CPC分类号： G06K19/0701 , G06K19/0723 , G06K19/073
摘要： The present invention provides an RFID transponder that includes a state holding cell (24) that maintains the present state of the RFID transponder during temporary losses of power. After power is restored to the RFID transponder, the state holding cell restores the present state to the RFID transponder so that transactions with an RFID interrogator can continue without having re-transmit redundant commands. The RFID transponder further comprises an RF front end (14) adapted to receive an interrogating RF signal. An analog circuit (18) is coupled to the RF front end and is adapted to recover analog signals from the received interrogating RF signal. The analog circuit provides state information defining a desired state of the RFID transponder corresponding to the analog signals. A digital state machine (20) is coupled to the analog circuit and adapted to execute at least one command in accordance with the state information. A memory (22) is coupled to the digital state machine and is adapted to store and retrieve digital data responsive to the at least one command executed by the digital state machine. A power capacitor (16) is coupled to the RF front end and derives a voltage rectified from the interrogating RF signal to charge the power capacitor. The power capacitor thereby provides electrical power for the analog circuit, the digital state machine and the memory. The state holding cell (24) is coupled to the analog circuit and the digital state machine and is adapted to maintain the state information during a loss in power provided by the power capacitor due to lapse in receipt of the interrogating RF signal by the RF front end.
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